Strange things are happening 12,000 metres above the USA. Fighter jets have shot down four balloons. They were a danger to airplanes. The White House said the balloons were not linked to aliens. It said the American people didn't need to worry about aliens because of the balloons.

The USA and China sent each other tit-for-tat messages. The US thinks the balloons are spy balloons. There is no proof of this. China said the balloons are for checking the weather, not for spying. China said US balloons have flown in China's airspace over ten times in the past year. The USA said this was not true.